2. a long mark of very slight breadth, made with a pen, pencil, tool, etc., on a surface . Line
3. Texture The visual and tactile quality of the surface of a work of art resulting from the way in which the materials are used.
4. C o l o r the quality of an object or substance with respect to light reflected by it, usu. determined visually by measurem ent of hue, satura tion, and brightness of the reflected light; saturation or chroma; hue.
5. Space (Negative/positive) external appearance of a clearly defined area, as distinguished from color or material; configuration: a triangular form.
6. Forms extern al appearance of a clearly defined a rea, as distinguished from color or mat erial; configur ation: a triangular form.